fix: do not signal onComplete when the incoming buffer length is less than the cipher block#209
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## [3.1.2](v3.1.1...v3.1.2) (2024-03-21) ### Fixes * create clients only if necessary ([#187](#187)) ([ea0c0c7](ea0c0c7)) * do not signal onComplete when the incoming buffer length is less than the cipher block ([#209](#209)) ([8b1a686](8b1a686)) ### Maintenance * fix dependabot.yml ([#190](#190)) ([5ee8b08](5ee8b08)) * modify range to allow queries specifying only the start index ([#184](#184)) ([765b9c6](765b9c6)) * **README:** detail no unencrypted pass through ([#189](#189)) ([576ea66](576ea66)), closes [#186](#186) [/github.com//issues/186#issuecomment-1973016669](https://github.com/aws//github.com/aws/amazon-s3-encryption-client-java/issues/186/issues/issuecomment-1973016669)
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Issue #, if available: #185
Description of changes: The current implementation of the
CipherSubscriberincorrectly assumes that the incomingByteBufferwill only contain fewer bytes than the block cipher when it is the final block. In fact, the incomingByteBuffercould have fewer bytes in cases where e.g. the networking conditions are poor. As a result, theCipherSubscribermay erroneously callonComplete()partway through the operation, which then fails due to contentLength mismatch. Additionally, as pointed out in #185, theCipherSubscribermay instead throw a NPE whenamountToReadFromByteBufferis greater than the block size.This PR fixes both bugs by instead checking if the
contentReadis equal tocontentLengthbefore signalingonComplete. If the data has not been fully read, then theCipherSubscriberpasses an empty array to avoid blocking such that subsequentonNext()invocations will fill up the cipher's underlying buffer until it has enough bytes to process a full block.Also, adds a test which was failing before this change. It requires specifying BouncyCastle as the JCE Provider as other providers (SunJCE, ACCP) return empty buffers instead of
null.By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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